import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  late AnimationController _controller;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
          child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          SlidingBox(_controller, Colors.blue[100]!, Interval(0, 0.2)),
          SlidingBox(_controller, Colors.blue[300]!, Interval(0.2, 0.4)),
          SlidingBox(_controller, Colors.blue[500]!, Interval(0.4, 0.6)),
          SlidingBox(_controller, Colors.blue[700]!, Interval(0.6, 0.8)),
          SlidingBox(_controller, Colors.blue[900]!, Interval(0.8, 1.0)),
        ],
      )),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          _controller.stop();
        },
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: const Duration(seconds: 1),
      vsync: this,
    )..repeat(reverse: true);
    // _controller.addListener(() {
    //   print("${_controller.value}");
    // });
  }

  @override
  void dispose() {
    _controller.dispose();
  }
}

class SlidingBox extends StatelessWidget {
  final AnimationController controller;

  final Color color;
  final Interval interval;

  SlidingBox(this.controller, this.color, this.interval);

  @override
  Widget build(BuildContext context) {
    return SlideTransition(
      position: Tween(begin: Offset.zero, end: Offset(0.1, 0))
          .chain(CurveTween(curve: interval))
          .animate(controller),
      child: Container(
        width: 300,
        height: 100,
        color: color,
      ),
    );
  }
}
